CN106533218B - Three-phase rectification circuit and drive control method - Google Patents
Three-phase rectification circuit and drive control method Download PDFInfo
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- CN106533218B CN106533218B CN201710007016.9A CN201710007016A CN106533218B CN 106533218 B CN106533218 B CN 106533218B CN 201710007016 A CN201710007016 A CN 201710007016A CN 106533218 B CN106533218 B CN 106533218B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
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Abstract
The invention provides a three-phase rectification circuit and a driving control method, wherein the three-phase rectification circuit comprises three-phase circuits, and in each phase circuit of the three-phase circuits, a switching circuit unit performs switching of closing and opening actions in a time-sharing manner in one period of alternating current output by an alternating current power supply; by switching the on and off operations of the switching circuit unit, in a half cycle in which the alternating current is the normal phase alternating current, the path conducted between the first common connection terminal and the second common connection terminal is sequentially switched to a path passing through the first saturated inductor and the switching circuit unit, a path passing through the first saturated inductor and the first driving circuit unit, a path passing through the second saturated inductor and the switching circuit unit, and a path passing through the second saturated inductor and the third driving circuit unit. The invention solves the problems that the switching loss of the power switching device is larger because the power switching device is in a hard switching state and the diode has larger reverse recovery charge in the traditional rectifier.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to a three-phase rectifying circuit and a driving control method.
Background
A conventional three-phase three-level three-switch (Vienna) rectifier is a high-efficiency rectifier topology that has emerged in recent years. The Vienna rectifier has the characteristics of three-level control and low voltage resistance of a power switching device, is high in efficiency and low in cost, and is widely applied. However, when the conventional Vienna rectifier works, the power switching devices are in a hard switching state, so that the switching loss of the power switching devices is large, and the diodes have reverse recovery charges, so that the switching loss of the power switching devices is increased, the electromagnetic interference (EMI) of a system is increased, and the design difficulty of system hardware is increased.
Disclosure of Invention
The invention provides a three-phase rectifier circuit and a drive control method, which aim to solve the problems that the switching loss of a power switch device is larger and a diode has larger reverse recovery charge because the power switch device is in a hard switching state when a traditional rectifier works.
In a first aspect, an embodiment of the present invention provides a three-phase rectification circuit, where the three-phase rectification circuit includes a first common connection terminal, a second common connection terminal, and three-phase circuits respectively connected between the first common connection terminal and the second common connection terminal, and each phase circuit in the three-phase circuits includes:
an alternating current power supply;
the first end of the first saturated inductor and the first end of the second saturated inductor are both connected with the alternating current power supply;
the first end of the first driving circuit unit and the first end of the second driving circuit unit are both connected with the second end of the first saturated inductor, and the second end of the first driving circuit unit and the second end of the second driving circuit unit are connected with the second common connecting end;
the first end of the third driving circuit unit and the first end of the fourth driving circuit unit are both connected with the second end of the second saturated inductor, and the second end of the third driving circuit unit and the second end of the fourth driving circuit unit are connected with the second common connecting end;
a first end of the switch circuit unit is connected with a terminal after the second end of the first saturated inductor and the second end of the second saturated inductor are connected, and the second end of the switch circuit unit is connected with a second common connecting end; wherein,
the switching circuit unit switches on and off in a time-sharing manner in one cycle of the alternating current output by the alternating current power supply; by switching the on and off actions of the switch circuit unit, in a half period of the alternating current which is the normal phase alternating current, a path for conducting the normal phase alternating current between the first common connecting end and the second common connecting end is sequentially switched into a path passing through the first saturated inductor and the switch circuit unit, a path passing through the first saturated inductor and the first drive circuit unit, a path passing through the second saturated inductor and the switch circuit unit, and a path passing through the second saturated inductor and the third drive circuit unit; in a half cycle of the alternating current which is negative-phase alternating current, a path for conducting the negative-phase alternating current between the first common connection end and the second common connection end sequentially comprises a path which passes through the first saturated inductor and the switch circuit unit, a path which passes through the first saturated inductor and the second drive circuit unit, a path which passes through the second saturated inductor and the switch circuit unit, and a path which passes through the second saturated inductor and the fourth drive circuit unit.
Optionally, each phase circuit further includes a filter inductor, the first end of the first saturable inductor and the first end of the second saturable inductor are connected to the ac power supply through the filter inductor, and the ac power supply of each phase circuit is connected to the first common connection terminal.
Optionally, the second terminal of the first driving circuit unit and the second terminal of the third driving circuit unit of each phase circuit are both connected to the second common connection terminal through a first capacitor and a first load arranged in parallel, and the second terminal of the second driving circuit unit and the second terminal of the fourth driving circuit unit of each phase circuit are both connected to the second common connection terminal through a second capacitor and a second load arranged in parallel.
Optionally, the first driving circuit unit includes a first diode, the second driving circuit unit includes a second diode, and an anode of the first diode and a cathode of the second diode are both connected to the second end of the first saturable inductor; the third driving circuit unit comprises a third diode, the fourth driving circuit unit comprises a fourth diode, and the anode of the third diode and the cathode of the fourth diode are both connected with the second end of the second saturated inductor; the cathode of the first diode and the cathode of the third diode are connected with the second common connecting end through a first capacitor and a first load which are arranged in parallel, and the anode of the second diode and the anode of the fourth diode are connected with the second common connecting end through a second capacitor and a second load which are arranged in parallel.
Optionally, the switch circuit unit includes a first switch group and a second switch group, the first switch group is connected between the second end of the first saturable inductor and the second common connection terminal, and the second switch group is connected between the second end of the second saturable inductor and the second common connection terminal.
Optionally, the first switch group comprises a first Insulated Gate Bipolar Transistor (IGBT) tube connected with a diode in parallel and a second IGBT tube connected with a diode in parallel, wherein a collector of the first IGBT tube is connected with the second end of the first saturable inductor, and an emitter of the first IGBT tube is connected with an emitter of the second IGBT tube; the second switch group comprises a third IGBT tube and a fourth IGBT tube, the third IGBT tube is connected with the diode in parallel, a collector electrode of the third IGBT tube is connected with the second end of the second saturated inductor, an emitter electrode of the third IGBT tube is connected with an emitter electrode of the second IGBT tube and an emitter electrode of the fourth IGBT tube respectively, and a collector electrode of the second IGBT tube and a collector electrode of the fourth IGBT tube are connected with the second common connection end.
On the other hand, an embodiment of the present invention provides a drive control method for a three-phase rectifier circuit, where the drive control method is applied to the three-phase rectifier circuit in the first aspect, and the drive control method includes:
in a half cycle that alternating current is positive alternating current, sequentially outputting a first control signal to the switch circuit unit to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the switch circuit unit; outputting a second control signal to the switch circuit unit to disconnect the switch circuit unit, wherein a passage for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the first drive circuit unit; outputting a third control signal to the switch circuit unit to turn on the switch circuit unit, wherein a path for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the switch circuit unit; outputting a fourth control signal to the switch circuit unit to disconnect the switch circuit unit, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the third drive circuit unit;
in a half-cycle of which the alternating current is negative alternating current, sequentially outputting a fifth control signal to the switch circuit unit to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the switch circuit unit; outputting a sixth control signal to the switch circuit unit to disconnect the switch circuit unit, wherein a passage for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the second drive circuit unit; outputting a seventh control signal to the switch circuit unit to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the switch circuit unit; and outputting an eighth control signal to the switch circuit unit to disconnect the switch circuit unit, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the fourth drive circuit unit.
Optionally, the drive control method further includes: in a half cycle that the alternating current is positive alternating current, sequentially outputting a first control signal to a first switch group to enable the first switch group to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the first switch group; a second control signal is output to the first switch group to disconnect the second switch group, and a passage for communicating the first common connection end and the second common connection end is formed between the first saturated inductor and the first drive circuit unit; outputting a third control signal to the second switch group to enable the third switch group to be conducted, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the second switch group; a fourth control signal is output to the second switch group to disconnect the second switch group, and a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the third drive circuit unit; in a half-cycle of which the alternating current is negative alternating current, sequentially outputting a fifth control signal to the first switch group to enable the first switch group unit to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the first switch group; outputting a sixth control signal to the first switch group to disconnect the first switch group, wherein a path for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the second drive circuit unit; outputting a seventh control signal to the second switch group to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the second switch group; and outputting an eighth control signal to the second switch group to disconnect the second switch group, wherein a path for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the fourth driving circuit unit.
The invention has the beneficial effects that:
in the embodiment of the invention, when the switching of the closing and opening actions of the switch circuit unit is controlled in a time-sharing manner by using the inductance characteristics of the first saturated inductor and the second saturated inductor, in a half period of the alternating current being the forward alternating current, a path for conducting the forward alternating current between the first common connection end and the second common connection end is sequentially switched to a path passing through the first saturated inductor and the switch circuit unit, a path passing through the first saturated inductor and the first drive circuit unit, a path passing through the second saturated inductor and the switch circuit unit, and a path passing through the second saturated inductor and the third drive circuit unit. Therefore, in a half period when the alternating current is the forward alternating current, the characteristic that the saturated inductor has the initial inductance value and when the current flowing through the saturated inductor reaches a certain value, the impedance of the saturated inductor to the current is reduced to zero can be utilized, so that the current flowing through the first saturated inductor and the second saturated inductor can not be suddenly changed, the current is almost zero when the switch circuit unit is conducted, the switch circuit unit works in a zero-current switching-on state, and the switching loss of the switch circuit unit is zero. In addition, when the switch circuit unit is a diode, the characteristic of a saturated inductor can be utilized simultaneously, so that the reverse current change in the diode is consistent with the current change in the saturated inductor, the reverse recovery charge of the diode is reduced to a great extent, the power loss of a three-phase rectification circuit is reduced, and the problems that the switching loss of a power switch device is large and the diode has large reverse recovery charge due to the fact that the power switch device is in a hard switching state when a traditional rectifier works are solved.
Drawings
Fig. 1 shows a block circuit diagram of a three-phase rectifier circuit in a first embodiment of the invention;
fig. 2 shows a schematic circuit diagram of a three-phase rectifier circuit in a first embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The first embodiment:
fig. 1 is a block diagram of a three-phase rectifier circuit in this embodiment. This three-phase rectifier circuit includes first public link 1, second public link 2 and connects the three-phase circuit between first public link 1 and second public link 2 respectively, and each looks circuit in this three-phase circuit all includes:
an alternating current power supply 3;
the first end of the first saturated inductor 4 and the first end of the second saturated inductor 5 are both connected with the alternating current power supply 3;
a first driving circuit unit 6 and a second driving circuit unit 7, wherein a first end of the first driving circuit unit 6 and a first end of the second driving circuit unit 7 are both connected with a second end of the first saturable inductor 4, and a second end of the first driving circuit unit 6 and a second end of the second driving circuit unit 7 are connected with the second common connection end 2;
a third driving circuit unit 8 and a fourth driving circuit unit 9, wherein a first end of the third driving circuit unit 8 and a first end of the fourth driving circuit unit 9 are both connected with a second end of the second saturable inductor 5, and a second end of the third driving circuit unit 8 and a second end of the fourth driving circuit unit 9 are connected with the second common connection terminal 2;
a first end of the switch circuit unit 10 is connected with a terminal after the second end of the first saturated inductor 4 and the second end of the second saturated inductor 5 are connected, and a second end of the switch circuit unit 10 is connected with the second common connection end 2; wherein,
the switching circuit unit 10 performs switching of the on and off operations in a time-division manner in one cycle of the alternating current output from the alternating current power supply 3; by switching the on and off operations of the switching circuit unit 10, in a half cycle in which the alternating current is the positive-phase alternating current, the path for conducting the positive-phase alternating current between the first common connection terminal 1 and the second common connection terminal 2 is sequentially switched to a path through the first saturated inductor 4 and the switching circuit unit 10, a path through the first saturated inductor 4 and the first drive circuit unit 6, a path through the second saturated inductor 5 and the switching circuit unit 10, and a path through the second saturated inductor 5 and the third drive circuit unit 8; in a half cycle of the alternating current with the negative phase, a path for conducting the negative phase alternating current between the first common connection terminal 1 and the second common connection terminal 2 is a path through the first saturable inductor 4 and the switching circuit unit 10, a path through the first saturable inductor 4 and the second driving circuit unit 7, a path through the second saturable inductor 5 and the switching circuit unit 10, and a path through the second saturable inductor 5 and the fourth driving circuit unit 9 in sequence.
Thus, by switching the on and off operations of the switch circuit unit 10, in a half period in which the ac is the normal phase ac, in a first working process, that is, when the switch circuit unit 10 is closed, the first saturated inductor 4 and the switch circuit unit 10 form a path between the first common connection terminal 1 and the second common connection terminal 2, the characteristic that the saturated inductor has an initial inductance and when the current flowing through the saturated inductor reaches a certain value, the impedance of the saturated inductor to the current decreases to zero is utilized, so that the current flowing through the first saturated inductor 4 cannot suddenly change, and thus the current of the switch circuit unit 10 is almost zero when the switch circuit unit is turned on, which makes the switch circuit unit operate in a zero current on state, thereby realizing soft on of the switch circuit unit, and further making the on loss of the switch circuit unit zero. In the second operation process, that is, when the switch circuit unit 10 is switched from closed to open, and the first saturable inductor 4 and the first driver circuit unit 6 form a path between the first common connection terminal 1 and the second common connection terminal 2, since the impedance of the first saturable inductor 4 to the current in the first operation process decreases to zero, when the first saturable inductor 4 and the first driver circuit unit 6 form a path between the first common connection terminal 1 and the second common connection terminal 2, the power consumed on the conduction path can be reduced to the maximum extent. In the third working process, that is, when the switch circuit unit 10 is switched from off to on, and the second saturated inductor 5 and the switch circuit unit 10 form a path between the first common connection terminal 1 and the second common connection terminal 2, at this time, by using the characteristic that the saturated inductor has initial inductance and when the current flowing through the saturated inductor reaches a certain value, the impedance of the saturated inductor to the current is reduced to zero, the current flowing through the second saturated inductor 5 cannot be suddenly changed, so that the current is almost zero when the switch circuit unit 10 is turned on, which causes the switch circuit unit 10 to work in a zero-current on state, soft on of the switch circuit unit is realized, so that the on loss of the switch circuit unit is zero, and in addition, if the first driving circuit unit is a diode at this time, while the current flowing through the second saturated inductor 5 cannot be suddenly changed, the reverse current flowing through the diode can not be suddenly changed, so that the change of the reverse current in the diode is consistent with the change of the current in the second saturated inductor 5, the reverse recovery charge of the diode is reduced to a great extent, and the power loss of the three-phase rectification circuit is reduced. In the fourth operation process, that is, when the switching circuit unit 10 is switched from closed to open, and the second saturable inductor 5 and the third driver circuit unit 8 form a path between the first common connection terminal 1 and the second common connection terminal 2, since the impedance of the second saturable inductor 5 to the current in the third operation process decreases to zero, when the second saturable inductor 5 and the third driver circuit unit 8 form a path between the first common connection terminal 1 and the second common connection terminal 2, the power consumed on the conduction path can be reduced to the maximum extent.
In addition, by switching the on and off operations of the switch circuit unit 10, in a half period of the negative-phase alternating current, in a first working process, that is, when the switch circuit unit 10 is closed, the first saturated inductor 4 and the switch circuit unit 10 form a path between the first common connection terminal 1 and the second common connection terminal 2, the characteristic that the saturated inductor has an initial inductance and when the current flowing through the saturated inductor reaches a certain value, the impedance of the saturated inductor to the current is reduced to zero is utilized, so that the current flowing through the first saturated inductor 4 cannot be suddenly changed, and the current is almost zero when the switch circuit unit 10 is turned on, so that the switch circuit unit operates in a zero-current turning-on state, soft turning-on of the switch circuit unit is realized, and the turning-on loss of the switch circuit unit is zero. In the second operation process, that is, when the switch circuit unit 10 is switched from closed to open, and the first saturable inductor 4 and the second drive circuit unit 7 form a path between the first common connection terminal 1 and the second common connection terminal 2, since the impedance of the first saturable inductor 4 to the current in the first operation process is reduced to zero, when the first saturable inductor 4 and the second drive circuit unit 7 form a path between the first common connection terminal 1 and the second common connection terminal 2, the power consumed on the conduction path can be reduced to the maximum extent. In the third working process, that is, when the switch circuit unit 10 is switched from off to on, and the second saturated inductor 5 and the switch circuit unit 10 form a path between the first common connection terminal 1 and the second common connection terminal 2, at this time, by using the characteristic that the saturated inductor has initial inductance and when the current flowing through the saturated inductor reaches a certain value, the impedance of the saturated inductor to the current is reduced to zero, the current flowing through the second saturated inductor 5 cannot be suddenly changed, so that the current is almost zero when the switch circuit unit 10 is turned on, which causes the switch circuit unit 10 to work in a zero-current on state, soft on of the switch circuit unit is realized, so that the on loss of the switch circuit unit is zero, and in addition, if the first driving circuit unit is a diode at this time, while the current flowing through the second saturated inductor 5 cannot be suddenly changed, the reverse current flowing through the diode can not be suddenly changed, so that the change of the reverse current in the diode is consistent with the change of the current in the second saturated inductor 5, the reverse recovery charge of the diode is reduced to a great extent, and the power loss of the three-phase rectification circuit is reduced. In the fourth operation process, that is, when the switch circuit unit 10 is switched from on to off, and the second saturable inductor 5 and the fourth driver circuit unit 9 form a path between the first common connection terminal 1 and the second common connection terminal 2, since the impedance of the second saturable inductor 5 to the current is reduced to zero in the third operation process, when the second saturable inductor 5 and the third driver circuit unit 8 form a path between the first common connection terminal 1 and the second common connection terminal 2, the power consumed on the conduction path can be reduced to the maximum extent.
Therefore, in the cycle period of the alternating current output by the alternating current power supply, the switch circuit unit can work in a zero current switching-on state, so that the switching loss of the switch circuit unit is zero, the reverse current change in the diode is consistent with the current change in the saturated inductor, the reverse recovery charge of the diode is reduced to a great extent, the power loss of the three-phase rectifier circuit is reduced, and the problems that the switching loss of the power switch device is large due to the fact that the power switch device is in a hard switching state and the diode has large reverse recovery charge when a traditional rectifier works are solved.
Further, fig. 2 shows a schematic diagram of currents in a three-phase rectifier circuit according to a first embodiment of the present invention. Each phase circuit in the three-phase rectification circuit is the same, and only one phase circuit is labeled here for explanation. Referring to fig. 1 and 2, each phase circuit further includes a filter inductor 11, the first end of the first saturable inductor 4 and the first end of the second saturable inductor 5 are connected to the ac power supply 3 through the filter inductor 11, and the ac power supply 3 of each phase circuit is connected to the first common connection terminal 1. In this way, the filter inductor 11 is added between the ac power supply 3 and the first and second saturable inductors 4 and 5, and the filter effect can be improved.
Further, with continued reference to fig. 1 and 2, the second terminal of the first driving circuit unit 6 and the second terminal of the third driving circuit unit 8 of each phase circuit are connected to the second common connection terminal 2 through a first capacitor 12 and a first load 13 arranged in parallel, and the second terminal of the second driving circuit unit 7 and the second terminal of the fourth driving circuit unit 9 of each phase circuit are connected to the second common connection terminal 2 through a second capacitor 14 and a second load 15 arranged in parallel. In this way, when the first saturable inductor 4 and the first driving circuit unit 6 form a path between the first common connection terminal 1 and the second common connection terminal 2, and the second saturable inductor 5 and the third driving circuit unit 8 form a path between the first common connection terminal 1 and the second common connection terminal 2, current can flow through the first capacitor 12 and the first load 13, thereby achieving the purpose of doing work; in addition, when the first saturable inductor 4 and the second drive circuit unit 7 form a path between the first common connection terminal 1 and the second common connection terminal 2, and the second saturable inductor 5 and the fourth drive circuit unit 9 form a path between the first common connection terminal 1 and the second common connection terminal 2, current can flow through the second capacitor 14 and the second load 15, thereby performing the purpose of performing work. In addition, the first common connection terminal may be a neutral wire of the power grid or a virtual neutral wire of the power grid. The second common connection end is the midpoint of the first capacitor and the second capacitor in the three-phase rectification circuit, and the input current of each phase circuit in the three-phase circuit can be controlled by a vector control method, so that the input current of the three-phase circuit is rectified.
Further, referring to fig. 2, the first driving circuit unit 6 includes a first diode 61, the second driving circuit unit 7 includes a second diode 71, and both the anode of the first diode 61 and the cathode of the second diode 71 are connected to the second end of the first saturable inductor 4; the third driving circuit unit 8 comprises a third diode 81, the fourth driving circuit unit 9 comprises a fourth diode 91, and the anode of the third diode 81 and the cathode of the fourth diode 91 are both connected with the second end of the second saturated inductor 5; the cathode of the first diode 61 and the cathode of the third diode 81 are connected with the second common connection end 2 through a first capacitor 12 and a first load 13 which are arranged in parallel, and the anode of the second diode 71 and the anode of the fourth diode 91 are connected with the second common connection end 2 through a second capacitor 14 and a second load 15 which are arranged in parallel. In this way, when switching from the second process to the third process and from the fourth process to the first process in the half cycle in which the alternating current is a positive-phase alternating current, it is possible to make the reverse current variation of the first diode 61 coincide with the current variation in the second saturable inductor 5 and make the reverse current variation of the third diode 81 coincide with the current variation in the first saturable inductor 4, thereby making it possible to reduce the reverse recovery charges of the first diode and the third diode to a large extent. In addition, when the alternating current is switched from the second process to the third process and from the fourth process to the first process in the half period of the negative-phase alternating current, the change of the reverse current of the second diode 71 can be made to be consistent with the change of the current in the second saturated inductor 5, and the change of the reverse current of the fourth diode 91 can be made to be consistent with the change of the current in the first saturated inductor 4, so that the reverse recovery charges of the first diode and the third diode can be reduced to a great extent, the power loss of the three-phase rectifying circuit can be reduced to the greatest extent, and the problem of electromagnetic interference can be reduced.
Further, with continued reference to fig. 2, the switching circuit unit 10 includes a first switch group 101 and a second switch group 102, the first switch group 101 is connected between the second end of the first saturable inductor 4 and the second common connection terminal 2, and the second switch group 102 is connected between the second end of the second saturable inductor 5 and the second common connection terminal 2.
In this way, the first switch group 101 and the second switch group 102 perform switching between the closing and opening operations at the time of sharing in one cycle of the alternating current output from the alternating current power supply. By switching the on and off actions of the first switch group 101 and the second switch group 102, in a half cycle in which the alternating current is the positive phase alternating current, a path for conducting the positive phase alternating current between the first common connection terminal 1 and the second common connection terminal 2 is sequentially switched to a path through the first saturated inductor 4 and the first switch group 101, a path through the first saturated inductor 4 and the first driving circuit unit 6, a path through the second saturated inductor 5 and the second switch group 102, and a path through the second saturated inductor 5 and the third driving circuit unit 8; in a half cycle of the alternating current with the negative phase, a path for conducting the negative phase alternating current between the first common connection terminal 1 and the second common connection terminal 2 is a path passing through the first saturable inductor 4 and the first switch group 101, a path passing through the first saturable inductor 4 and the second drive circuit unit 7, a path passing through the second saturable inductor 5 and the second switch group 102, and a path passing through the second saturable inductor 5 and the fourth drive circuit unit 9 in sequence.
Specifically, the first switch group 101 includes a first insulated gate bipolar transistor IGBT tube connected in parallel with a diode and a second IGBT tube connected in parallel with a diode, wherein a collector of the first IGBT tube is connected to the second end of the first saturable inductor 4, and an emitter of the first IGBT tube is connected to an emitter of the second IGBT tube; the second switch group 102 comprises a third IGBT connected with a diode in parallel and a fourth IGBT connected with a diode in parallel, wherein a collector of the third IGBT is connected with the second end of the second saturable inductor 5, an emitter of the third IGBT is connected with an emitter of the second IGBT and an emitter of the fourth IGBT respectively, and a collector of the second IGBT and a collector of the fourth IGBT are connected with the second common connection end 2. In this way, the first switch group 101 and the second switch group 102 can be normally turned on regardless of the output current of the ac power supply, i.e., the positive current and the negative current.
In the cycle period of the alternating current output by the alternating current power supply, the switch circuit unit can work in a zero current switching-on state, so that the switching loss of the switch circuit unit is zero, the reverse current change in the diode is consistent with the current change in the saturated inductor, the reverse recovery charge of the diode is reduced to a great extent, the power loss of the three-phase rectifier circuit is reduced, the electromagnetic interference is reduced, and the problems that the switching loss of a power switch device is large due to the fact that the power switch device is in a hard switching state when a traditional rectifier works, and the diode has large reverse recovery charge are solved.
Second embodiment:
the present embodiment provides a drive control method of a three-phase rectifier circuit, which is applied to the three-phase rectifier circuit in the first embodiment, the drive control method including:
in a half cycle that the alternating current is positive alternating current, first control signals are sequentially output to the switch circuit unit to enable the switch circuit unit to be conducted, and a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the switch circuit unit; a second control signal is output to the switch circuit unit to disconnect the switch circuit unit, and a passage for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the first drive circuit unit; outputting a third control signal to the switch circuit unit to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the second saturated inductor and the switch circuit unit; a fourth control signal is output to the switch circuit unit to disconnect the switch circuit unit, and a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the third drive circuit unit;
in a half period of which the alternating current is negative alternating current, outputting a fifth control signal to the switch circuit unit in sequence to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the switch circuit unit; outputting a sixth control signal to the switch circuit unit to disconnect the switch circuit unit, wherein a passage for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the second drive circuit unit; outputting a seventh control signal to the switch circuit unit to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the second saturated inductor and the switch circuit unit; and an eighth control signal is output to the switch circuit unit to disconnect the switch circuit unit, and a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the fourth drive circuit unit.
Therefore, in a half-cycle of the forward alternating current, when a first control signal is output to the switch circuit unit, the switch circuit unit is conducted, and a path for communicating the first common connection end and the second common connection end is formed between the first saturated inductor and the switch circuit unit, so that in the conducting process of the switch circuit unit, the characteristic that the saturated inductor has initial inductance and when the current flowing through the saturated inductor reaches a certain value, the impedance of the saturated inductor to the current is reduced to zero can be utilized, the current flowing through the first saturated inductor can not be suddenly changed, the current of the switch circuit unit is almost zero when the switch circuit unit is conducted, the switch circuit unit works in a zero-current conducting state, soft-conducting of the switch circuit unit is realized, and the conducting loss of the switch circuit unit is zero. When the second control signal is output to the switch circuit unit, the switch circuit unit is disconnected, a path for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the first drive circuit unit, and at the moment, because the impedance of the first saturated inductor to current is reduced to zero when the first control signal is output to the switch circuit unit, the power consumed on the path formed by the first saturated inductor and the first drive circuit unit can be reduced to the maximum degree. When the third control signal is output to the switch circuit unit, the switch circuit unit is conducted, and a path for communicating the first common connection end and the second common connection end is formed between the second saturated inductor and the switch circuit unit, so that in the conducting process of the switch circuit unit, the characteristic that the saturated inductor has initial inductance and the impedance of the saturated inductor to current is reduced to zero when the current flowing through the saturated inductor reaches a certain value can be utilized, the current flowing through the second saturated inductor cannot suddenly change, the current of the switch circuit unit is almost zero when the switch circuit unit is conducted, the switch circuit unit works in a zero current conducting state, the soft switching-on of the switch circuit unit is realized, the conducting loss of the switch circuit unit is zero, in addition, if the first driving circuit unit is a diode at the moment, the current flowing through the second saturated inductor cannot suddenly change, the reverse current flowing through the diode can not be suddenly changed, so that the change of the reverse current in the diode is consistent with the change of the current in the second saturated inductor, the reverse recovery charge of the diode is reduced to a great extent, and the power loss of the three-phase rectifying circuit is reduced. When the fourth control signal is output to the switch circuit unit, the switch circuit unit is disconnected, a path for communicating the first common connection end and the second common connection end is formed between the second saturated inductor and the third drive circuit unit, and at the moment, when the third control signal is output to the switch circuit unit, the impedance of the second saturated inductor to current is reduced to zero, so that when the second saturated inductor and the third drive circuit unit form the path between the first common connection end and the second common connection end, the power consumed on the conduction path can be reduced to the maximum extent.
It should be noted that, in the half period of the alternating current with the negative alternating current, the current conduction principle is the same as that in the half period of the alternating current with the positive alternating current, and the description thereof is omitted. Therefore, in the cycle period of the alternating current output by the alternating current power supply, the switch circuit unit can work in a zero current switching-on state, so that the switching loss of the switch circuit unit is zero, the reverse current change in the diode is consistent with the current change in the saturated inductor, the reverse recovery charge of the diode is reduced to a great extent, the power loss of the three-phase rectifier circuit is reduced, and the problems that the switching loss of the power switch device is large due to the fact that the power switch device is in a hard switching state and the diode has large reverse recovery charge when a traditional rectifier works are solved.
Specifically, when the three-phase rectification circuit is driven, a first control signal can be sequentially output to the first switch group within a half period of the forward alternating current, so that the first switch group is conducted, and a path for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the first switch group; a second control signal is output to the first switch group to disconnect the second switch group, and a passage for communicating the first common connection end and the second common connection end is formed between the first saturated inductor and the first drive circuit unit; outputting a third control signal to the second switch group to enable the third switch group to be conducted, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the second switch group; a fourth control signal is output to the second switch group to disconnect the second switch group, and a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the third drive circuit unit;
in a half-cycle of which the alternating current is negative alternating current, sequentially outputting a fifth control signal to the first switch group to enable the first switch group unit to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the first switch group; outputting a sixth control signal to the first switch group to disconnect the first switch group, wherein a path for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the second drive circuit unit; outputting a seventh control signal to the second switch group to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the second switch group; and outputting an eighth control signal to the second switch group to disconnect the second switch group, wherein a path for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the fourth driving circuit unit.
Therefore, the conduction path between the first public connecting end and the second public connecting end is controlled by respectively controlling the conduction and the disconnection of the first switch group and the conduction and the disconnection of the second switch group, so that the control is more accurate, and the first switch group and the second switch group can work in a zero-current conduction state, so that the conduction losses of the first switch group and the second switch group are zero, the reverse current change in the diode can be consistent with the current change in the saturated inductor, the reverse recovery charge of the diode is reduced to a great extent, and the problems that the switching loss of a power switch device is large due to the fact that the power switch device is in a hard switching state and the diode has large reverse recovery charge when a traditional rectifier works are solved.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (8)
1. The utility model provides a three-phase rectifier circuit, three-phase rectifier circuit includes first public link, second public link and connects respectively in first public link with three-phase circuit between the second public link, its characterized in that, each looks circuit in the three-phase circuit all includes:
an alternating current power supply;
the first end of the first saturated inductor and the first end of the second saturated inductor are both connected with the alternating current power supply;
the first end of the first driving circuit unit and the first end of the second driving circuit unit are both connected with the second end of the first saturated inductor, and the second end of the first driving circuit unit and the second end of the second driving circuit unit are connected with the second common connecting end;
the first end of the third driving circuit unit and the first end of the fourth driving circuit unit are both connected with the second end of the second saturated inductor, and the second end of the third driving circuit unit and the second end of the fourth driving circuit unit are connected with the second common connecting end;
a first end of the switch circuit unit is connected with a terminal after the second end of the first saturated inductor and the second end of the second saturated inductor are connected, and the second end of the switch circuit unit is connected with a second common connecting end; wherein,
the switching circuit unit switches on and off in a time-sharing manner in one cycle of the alternating current output by the alternating current power supply; by switching the on and off actions of the switch circuit unit, in a half period of the alternating current which is the normal phase alternating current, a path for conducting the normal phase alternating current between the first common connecting end and the second common connecting end is sequentially switched into a path passing through the first saturated inductor and the switch circuit unit, a path passing through the first saturated inductor and the first drive circuit unit, a path passing through the second saturated inductor and the switch circuit unit, and a path passing through the second saturated inductor and the third drive circuit unit; in a half cycle of the alternating current which is negative-phase alternating current, a path for conducting the negative-phase alternating current between the first common connection end and the second common connection end sequentially comprises a path which passes through the first saturated inductor and the switch circuit unit, a path which passes through the first saturated inductor and the second drive circuit unit, a path which passes through the second saturated inductor and the switch circuit unit, and a path which passes through the second saturated inductor and the fourth drive circuit unit.
2. The three-phase rectification circuit according to claim 1, wherein each phase circuit further comprises a filter inductor, the first end of the first saturable inductor and the first end of the second saturable inductor are connected to the ac power supply through the filter inductor, and the ac power supply of each phase circuit is connected to the first common connection terminal.
3. The three-phase rectification circuit according to claim 1, wherein the second terminal of the first driving circuit unit and the second terminal of the third driving circuit unit of each phase circuit are connected to the second common connection terminal through a first capacitor and a first load arranged in parallel, and the second terminal of the second driving circuit unit and the second terminal of the fourth driving circuit unit of each phase circuit are connected to the second common connection terminal through a second capacitor and a second load arranged in parallel.
4. The three-phase rectification circuit according to claim 1, wherein the first driving circuit unit comprises a first diode, the second driving circuit unit comprises a second diode, and an anode of the first diode and a cathode of the second diode are both connected to the second end of the first saturable inductor; the third driving circuit unit comprises a third diode, the fourth driving circuit unit comprises a fourth diode, and the anode of the third diode and the cathode of the fourth diode are both connected with the second end of the second saturated inductor; the negative pole of the first diode and the negative pole of the third diode are connected with the second common connecting end through the first capacitor and the first load which are arranged in parallel, and the positive pole of the second diode and the positive pole of the fourth diode are connected with the second common connecting end through the second capacitor and the second load which are arranged in parallel.
5. The three-phase rectification circuit according to claim 1, wherein the switching circuit unit includes a first switch group and a second switch group, the first switch group being connected between the second end of the first saturable inductor and the second common connection terminal, the second switch group being connected between the second end of the second saturable inductor and the second common connection terminal.
6. The three-phase rectification circuit according to claim 5, wherein the first switch group comprises a first Insulated Gate Bipolar Transistor (IGBT) tube connected with a diode in parallel and a second IGBT tube connected with a diode in parallel, wherein a collector electrode of the first IGBT tube is connected with the second end of the first saturation inductor, and an emitter electrode of the first IGBT tube is connected with an emitter electrode of the second IGBT tube; the second switch group comprises a third IGBT tube connected with a diode in parallel and a fourth IGBT tube connected with a diode in parallel, wherein a collector electrode of the third IGBT tube is connected with the second end of the second saturation inductor, an emitter electrode of the third IGBT tube is respectively connected with an emitter electrode of the second IGBT tube and an emitter electrode of the fourth IGBT tube, and a collector electrode of the second IGBT tube and a collector electrode of the fourth IGBT tube are both connected with the second common connection end.
7. A drive control method of a three-phase rectifier circuit applied to the three-phase rectifier circuit according to any one of claims 5 to 6, characterized by comprising:
in a half cycle that alternating current is positive alternating current, sequentially outputting a first control signal to the switch circuit unit to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the switch circuit unit; outputting a second control signal to the switch circuit unit to disconnect the switch circuit unit, wherein a passage for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the first drive circuit unit; outputting a third control signal to the switch circuit unit to turn on the switch circuit unit, wherein a path for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the switch circuit unit; outputting a fourth control signal to the switch circuit unit to disconnect the switch circuit unit, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the third drive circuit unit;
in a half-cycle of which the alternating current is negative alternating current, sequentially outputting a fifth control signal to the switch circuit unit to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the switch circuit unit; outputting a sixth control signal to the switch circuit unit to disconnect the switch circuit unit, wherein a passage for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the second drive circuit unit; outputting a seventh control signal to the switch circuit unit to enable the switch circuit unit to be conducted, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the switch circuit unit; and outputting an eighth control signal to the switch circuit unit to disconnect the switch circuit unit, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the fourth drive circuit unit.
8. The drive control method according to claim 7, characterized by further comprising:
in a half cycle that the alternating current is positive alternating current, sequentially outputting a first control signal to a first switch group to enable the first switch group to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the first switch group; a second control signal is output to the first switch group to disconnect the first switch group, and a passage for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the first drive circuit unit; outputting a third control signal to the second switch group to enable the second switch group to be conducted, wherein a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the second switch group; a fourth control signal is output to the second switch group to disconnect the second switch group, and a passage for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the third drive circuit unit;
in a half-cycle of which the alternating current is negative alternating current, sequentially outputting a fifth control signal to the first switch group to enable the first switch group to be conducted, wherein a passage for communicating the first common connecting end with the second common connecting end is formed between the first saturated inductor and the first switch group; outputting a sixth control signal to the first switch group to disconnect the first switch group, wherein a path for communicating the first common connection end with the second common connection end is formed between the first saturated inductor and the second drive circuit unit; outputting a seventh control signal to the second switch group to turn on the second switch group of the switch circuit unit, wherein a path for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the second switch group; and outputting an eighth control signal to the second switch group to disconnect the second switch group, wherein a path for communicating the first common connection end with the second common connection end is formed between the second saturated inductor and the fourth driving circuit unit.
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| CN101309054B (en) * | 2008-06-20 | 2010-12-29 | 南京航空航天大学 | Three-level double boost energy feedback PWM rectification circuit and control method thereof |
| CN204205997U (en) * | 2014-12-04 | 2015-03-11 | 艾默生网络能源有限公司 | A kind of rectified three-phase circuit and uninterrupted power supply |
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